I am using a Primefaces Premium theme I added the necessary jars to its classpath but encountered an error I could not debug because it seems to be not java related but xml/jsf related
faces-config.xml
Multiple annotations found at this line: - cvc-pattern-valid: Value 'primefaces-sentinel' is not facet-valid with respect to pattern '($|| \p{L})(\p{L}|\p{Nd}||$)*' for type 'null'. - cvc-complex-type.2.2: Element 'name' must have no element [children], and the value must be valid.
primefaces-sentinel.taglib.xml
cvc-complex-type.2.4.a: Invalid content was found starting with element 'description'. One of '{"http:// java.sun.com/xml/ns/javaee":handler-class, "http://java.sun.com/xml/ns/javaee":behavior, "http:// java.sun.com/xml/ns/javaee":component, "http://java.sun.com/xml/ns/javaee":converter, "http:// java.sun.com/xml/ns/javaee":validator, "http://java.sun.com/xml/ns/javaee":source}' is expected.